I'm quite in a rush. My betta fish I got yesterday night was soon GOING to be put into a new filtered 5-10 gallon tank. I put in the tap water conditioner and beneficial bacteria inside the water for betta fish. Now, I couldn't put the betta fish in the tank once it got used to the temperature of the water in the cup. The cup is kind of fat, and some tall decorations did make putting the fish into the water. Me and my dad had no net to put in the fish, plus it was getting late so we couldn't drive a 25 minute trip to the pet store especially when the fish is still in the cup.
My idea for putting the betta fish in the tank: Putting the cup in the water, then gently turning it so the betta fish could swim out once it got used to the temperature.
My dad's idea for putting the betta fish in the tank: Dump the water in with the betta fish, without letting the fish get used to the water.
I told my dad NO WAY, to not do it. I guess he didn't care, so since he was in charge, he did it his way. I couldn't do it my way much because the cup couldn't fit into the tank because of tall decorations.
When my dad did this, I cried to myself and argued that the fish could die of this.
A few minutes later I checked the betta fish, only finding it on the side and breathing hard with its gills.
The next day... My betta fish was found sticking to the top decorations. I could tell he wasn't alive because no tiny movements were done, and he wasn't resting either.
I told my dad about this, so he got a spoon and poked the fish. No reaction. Took out the fish. No reaction. So, the fish was dead
I cried once more, then telling my dad that he shouldn't have dumped the fish to the water.
So he blamed me, saying that the water was bad, and the conditioner didn't work, and I didn't set the filter right. I did set the filter right, and I even heard the clicking sound when closing the filter door (I have a square boxed filter). And, I put in the right measurements as well. But my dad saying this... It did make me go unsettled and uneven. I wasn't sure.
My dad said there was no such thing as of dumping a betta fish in the tank, and then he just dies the next day.
Question: Who's right (It doesn't matter who's side you're on, I just need to know the answer so that way that mistake won't happen again) and why.